Any action component can refresh part of a page using the
reRender attribute. This attribute contains a comma-separated list of identifiers (the
id values) of Visualforce view components to be refreshed when the action is completed. The identifiers must be of Visualforce components, not raw HTML elements. If no
reRender value is provided or the identifiers are invalid, the entire page is refreshed. This is the default behavior of an action component.
Listings 7.1 and 7.2 are a Visualforce page and controller that demonstrate partial page refresh. A
commandButton is defined to increment an integer value in the controller when clicked, via the
increment method. The amount to be incremented is passed from the page to controller ...